Hello Tim;
My name is Peter. I am a retired field service refrigeration technician.
You do not have a major problem. This is a easy fix.
When you open your freezer door and then close it you are pushing air into your freezer. This is where the sound is coming from.
On your drain tube in the back that goes to your drain pain there might be a black rubber grommet on the end. The initial design was to put this restrictive rubber element from having air go up your drain tube. Over time the rubber dries and restricts the defrost drain and retains water.
If you have this do what I do on service calls - remove it and throw it away.
You may have a snake type drain tube to your drain pan. Once again the manufacturers engineers, with no field experience, decided to put a loop in the drain tube to prevent warm air getting into your unit. Well, the defrost condensate gets caught in the loop. That is where you are hearing the noise.
The drain tube use to be a straight tube. And so, that is where we are back to. It worked fine. Manufacturers changed it and now us technicians put the straight drain tube back in.
Check the water valve on the back of the refrigerator if it has an ice maker. Make sure the valve is turned completely on and not constricting the flow of water to the refrigerator via the water supply line. You might also hear a simultaneous buzzing sound when the gurgling noise occurs. In some refrigerator models, this filling process is on a timer, and you might hear the buzzing and/or gurgling every 15 minutes or so.
Check the water supply line for leaks or damage. You might see a puddle of liquid on the floor. If air is pulled into the water line as the refrigerator is pulling in water, that can create a gurgling noise. Replace the damaged hose yourself, or contact an appliance repair technician for assistance
Wait while the refrigerator completes its defrosting cycle if you hear water dripping and gurgling in the freezer area. When the heating coil turns on, the melted water from the frost flows down to a drain pan for evaporation to take place. The defrost process usually takes about 30 minutes. This is automatic and cannot be prevented in most refrigerators. Keep the closed to try to prevent unnecessary frost buildup.
Wait while the water equalizes in the refrigerator if you hear a gurgling sound when shutting the door. This is normal and is a result of air being forced through the drain tube. The gurgling can last several seconds but should eventually dissipate this usually happens with old fridges upgrade its a good investment
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